JunHyuk
Network Working Group JH. Song
Radha
Request for Comments: 4494 R. Poovendran
Category: Standards Track University of Washington
Jicheol
J. Lee
INTERNET DRAFT
Samsung Electronics
Expires: August 2, 2006 February 3
June 2006
The AES-CMAC-96 Algorithm and its use Its Use with IPsec
draft-songlee-aes-cmac-96-04.txt
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Copyright (C) The Internet Society (2006).
Abstract
The National Institute of Standards and Technology (NIST) has newly
recently specified the Cipher based MAC (CMAC) Cipher-based Message Authentication Code
(CMAC), which is equivalent to the One-Key CBC-MAC1 (OMAC1) algorithm
submitted by Iwata and Kurosawa. OMAC1 efficiently reduces the key
size of Extended Cipher Block Chaining mode (XCBC). This memo
specifies the use of CMAC mode on the authentication mechanism of the
IPsec Encapsulating Security Payload (ESP) and the Authentication
Header (AH) protocols. This new algorithm is named AES-CMAC-96.
1. Introduction
The National Institute of Standards and Technology (NIST) has newly
recently specified the Cipher-based Message Authentication Code
(CMAC). CMAC [NIST-CMAC] is a message authentication code that is
based on a symmetric key block cipher such as the Advanced Encryption
Standard [NIST-AES]. CMAC is equivalent to the One-Key CBC MAC1
(OMAC1) submitted by Iwata and Kurosawa [OMAC1a, OMAC1b]. OMAC1 is
an improvement of the eXtended Cipher Block Chaining mode (XCBC)
submitted by Black and Rogaway [XCBCa, XCBCb], which itself is an
improvement of the basic CBC-MAC. XCBC efficiently addresses the
security deficiencies of CBC-MAC, and OMAC1 efficiently reduces the
key size of XCBC.
This memo specifies the usage of CMAC on the authentication mechanism
of the IPsec Encapsulating Security Payload (ESP) [ESP] and the Authentication
Header (AH) [AH] protocols. This new algorithm is named AES-CMAC-96. For
further information on AH and ESP, refer to [AH] and [ROADMAP].
2. Basic definitions Definitions
CBC Cipher Block Chaining mode of operation for message
authentication code.
MAC Message Authentication Code.
A bit string of a fixed length, computed by the MAC
generation algorithm, that is used to established establish the
authority and and, hence, the integrity of a message.
CMAC Cipher-based MAC based on an approved symmetric key
block cipher, such as the Advanced Encryption
Standard.
Key (K) 128-bits (16 octets) long 128-bit (16-octet) key for AES-128 cipher block.
Denoted by K.
Message (M) Message to be authenticated.
Denoted by M.
Length (len) The length of message M in octets.
Denoted by len.
Minimum
The minimum value of the length can be is 0. The maximum value of the length is not
specified in this document.
truncate(T,l) Truncate T (MAC) in msb-first most-significant-bit-first
(MSB-first) order with to a length of l octet. octets.
T The output of AES-CMAC AES-CMAC.
Truncated T The truncated output of AES-CMAC-128 in MSB first MSB-first
order.
AES-CMAC CMAC generation function based on AES block cipher
with 128-bits key 128-bit key.
AES-CMAC-96 IPsec AH and ESP MAC generation function based on
AES-CMAC
AES-CMAC, which truncates MSB the 96 most significant
bits of 128 bits
output the 128-bit output.
3. AES-CMAC
The core of AES-CMAC-96 is the AES-CMAC [AES-CMAC]. The underlying
algorithm
algorithms for AES-CMAC are the Advanced Encryption Standard cipher
block
[AES] [NIST-AES] and the recently defined CMAC mode of operation
[NIST-CMAC]. AES-CMAC provides stronger assurance of data integrity
than a checksum or an error detecting code. The verification of a
checksum or an error detecting code detects only accidental
modifications of the data, while CMAC is designed to detect
intentional, unauthorized modifications of the data, as well as
accidental modifications. The output of AES-CMAC can validate the
input message. Validating the message provide provides assurance of the
integrity and authenticity over the message from the source.
According to [NIST-CMAC] [NIST-CMAC], at least 64-bits 64 bits should be used for against
guessing attack. attacks. AES-CMAC achieves the similar security goal of
HMAC [RFC-HMAC]. Since AES-CMAC is based on a symmetric key block cipher, AES,
cipher (AES), while HMAC is based on a hash
function, such function (such as SHA-1, SHA-1),
AES-CMAC is appropriate for information systems in which AES is more
readily available than a hash function.
For detail Detailed information about
AES-CMAC is available in [AES-CMAC] and [NIST-CMAC].
4. AES-CMAC-96
For use in IPsec message authentication on AH and ESP, AES-CMAC-96 should be
used. AES-CMAC-96 is a AES-CMAC with 96-bit-long 96-bit truncated output in most significant bit first
MSB-first order. The output of 96 bits is a 96-bit MAC that will meet the
default authenticator length as specified in [AH]. The result of
truncation is taken in most significant bits
first MSB-first order. For further information on
AES-CMAC, refer to [AES-CMAC] and [NIST-CMAC].
Figure 1 describes AES-CMAC-96 algorithm:
In step 1, AES-CMAC is applied to the message 'M' M in length 'len' len with
key 'K' K.
In step 2, Truncate the output block, block T with is truncated to 12 octets in
msb-first-order MSB-first
order, and return TT. Truncated T (TT) is returned.
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ Algorithm AES-CMAC-96 +
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ +
+ Input : K (128-bit Key described in section Section 4.1) +
+ : M ( message (message to be authenticated ) authenticated) +
+ : len ( length (length of message in octets ) octets) +
+ Output : Truncated T (Truncated (truncated output with to length 12 octets)+ octets) +
+ +
+-------------------------------------------------------------------+
+ +
+ Step 1. T := AES-CMAC (K,M,len); +
+ Step 2. TT := truncate (T, 12); +
+ return TT; +
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Figure 1 1: Algorithm AES-CMAC-96
5. Test Vectors
These test cases are the same as those defined in [NIST-CMAC] [NIST-CMAC], with one
the exception of
96 bits truncation 96-bit truncation.
--------------------------------------------------
K 2b7e1516 28aed2a6 abf71588 09cf4f3c
Subkey Generation
AES_128(key,0) 7df76b0c 1ab899b3 3e42f047 b91b546f
K1 fbeed618 35713366 7c85e08f 7236a8de
K2 f7ddac30 6ae266cc f90bc11e e46d513b
Test Case 1: len = 0
M <empty string>
AES_CMAC_96 bb1d6929 e9593728 7fa37d12
Test Case 2: len = 16
M 6bc1bee2 2e409f96 e93d7e11 7393172a
AES_CMAC_96 070a16b4 6b4d4144 f79bdd9d
Test Case 3: len = 40
M 6bc1bee2 2e409f96 e93d7e11 7393172a
ae2d8a57 1e03ac9c 9eb76fac 45af8e51
30c81c46 a35ce411
AES_CMAC_96 dfa66747 de9ae630 30ca3261
Test Case 4: len = 64
M 6bc1bee2 2e409f96 e93d7e11 7393172a
ae2d8a57 1e03ac9c 9eb76fac 45af8e51
30c81c46 a35ce411 e5fbc119 1a0a52ef
f69f2445 df4f9b17 ad2b417b e66c3710
AES_CMAC_96 51f0bebf 7e3b9d92 fc497417
--------------------------------------------------
6. Interaction with the ESP Cipher Mechanism
As of this writing, there are no known issues which that preclude the use
of AES-CMAC-96 with any specific cipher algorithm.
7. Security Considerations
See the security consideration considerations section of [AES-CMAC].
8. IANA Consideration Considerations
The IANA should allocate a has allocated value 8 for IKEv2 Transform Type 3 (Integrity
Algorithm) to the AUTH_AES_CMAC_96 algorithm when this document is
published. algorithm.
9. Acknowledgement Acknowledgements
Portions of this text were borrowed from [NIST-CMAC] and
[AES-XCBC-MAC]. [XCBCa]. We
would like to thank to Russ Housley for his useful comments.
We acknowledge the support from the the following grants:
Collaborative Technology Alliance (CTA) from US Army Research
Laboratory, DAAD19-01-2-0011; Presidential Award from Army Research
Office, W911NF-05-1-0491; NSF CAREER, ANI-0093187. Results do not
reflect any position of the funding agencies.
10. References
10.1. Normative References
[NIST-CMAC] NIST, Special Publication 800-38B Draft,"Recommendation
for Block Cipher Modes of Operation: The CMAC Method
for Authentication," March 9, 2005
[NIST-AES] NIST, FIPS 197, "Advanced Encryption Standard (AES),"
November 2001.
http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
[ESP] Kent, S. and R. Atkinson, "IP Encapsulating Security
Payload (ESP)", RFC 2406, November 1998.
[AES-CMAC] JunHyuk Song, Jicheol Lee, Radha JH., Poovendran, Tetsu Iwata R., Lee, J., and T. Iwata, "The
AES-CMAC Algorithm" draft-songlee-aes-cmac-02.txt,
October 2005 (Work in progress)
10.2. Informative References Algorithm", RFC 4493, June 2006.
[AH] Kent, S. and R. Atkinson, "Security Architecture for the
Internet Protocol", S., "IP Authentication Header", RFC 2401, November 1998.
[ROADMAP] Thayer, R., Doraswamy, N. and R. Glenn, 4302, December
2005.
[ESP] Kent, S., "IP Encapsulating Security
Document Roadmap", Payload (ESP)", RFC 2411,
4303, December 2005.
[NIST-AES] NIST, FIPS 197, "Advanced Encryption Standard (AES)",
November 1998. 2001, http://csrc.nist.gov/publications/fips/
fips197/fips-197.pdf.
[NIST-CMAC] NIST, Special Publication 800-38B Draft, "Recommendation
for Block Cipher Modes of Operation: The CMAC Method for
Authentication", March 9, 2005.
10.2. Informative References
[OMAC1a] Tetsu Iwata and Kaoru Kurosawa, "OMAC: One-Key CBC MAC," MAC",
Fast Software Encryption, FSE 2003, LNCS 2887, pp. 129-153, 129-
153, Springer-Verlag, 2003.
[RFC-HMAC] Hugo Krawczyk, Mihir Bellare and Ran Canetti,
"HMAC: Keyed-Hashing for Message Authentication,"
RFC2104, February 1997.
[OMAC1] "OMAC: One-Key CBC MAC," Tetsu Iwata and Kaoru Kurosawa,
Department of Computer and Information Sciences,
Ilbaraki University, March 10, 2003.
[OMAC1b] Tetsu Iwata and Kaoru Kurosawa, "OMAC: One-Key CBC MAC," MAC",
Submission to NIST, December 2002. Available from the NIST modes of operation web site at
http://csrc.nist.gov/CryptoToolkit/modes/proposedmodes/
omac/omac-spec.pdf
omac/omac-spec.pdf.
[RFC-HMAC] Krawczyk, H., Bellare, M., and R. Canetti, "HMAC: Keyed-
Hashing for Message Authentication", RFC 2104, February
1997.
[ROADMAP] Thayer, R., Doraswamy, N., and R. Glenn, "IP Security
Document Roadmap", RFC 2411, November 1998.
[XCBCa] John Black and Phillip Rogaway, "A Suggestion for
Handling Arbitrary-Length Messages with the CBC MAC," MAC",
NIST Second Modes of Operation Workshop, August 2001.
Available from the NIST modes of operation web site at
http://csrc.nist.gov/CryptoToolkit/modes/proposedmodes/
xcbc-mac/xcbc-mac-spec.pdf http://csrc.nist.gov/CryptoToolkit/modes/
proposedmodes/xcbc-mac/xcbc-mac-spec.pdf.
[XCBCb] John Black and Phillip Rogaway, "CBC MACs for
Arbitrary-Length Arbitrary-
Length Messages: The Three-Key
Constructions," Constructions", Journal of
Cryptology, Vol. 18, No. 2, pp. 111-132, Springer-Verlag,
Spring 2005.
[XCBC] Black, J. and P. Rogaway, "A Suggestion for Handling
Arbitrary-Length Messages with the CBC MAC," NIST
Second Modes of Operation Workshop, August 2001.
http://csrc.nist.gov/CryptoToolkit/modes/proposedmodes/
xcbc-mac/xcbc-mac-spec.pdf
[IKEv2] Kaufman, C., Ed., "Internet Key Exchange (IKEv2)
Protocol", draft-ietf-ipsec-ikev2-17
(work in progress), September 2004.
11. Author's Address
Authors' Addresses
Junhyuk Song
University of Washington
Samsung Electronics
Phone: (206) 853-5843
songlee@ee.washington.edu
EMail: songlee@ee.washington.edu, junhyuk.song@samsung.com
Jicheol Lee
Samsung Electronics
Phone: +82-31-279-3605
EMail: jicheol.lee@samsung.com
Radha Poovendran
Network Security Lab (NSL)
Dept. of Electrical Engineering
University of Washington
Phone: (206) 221-6512
EMail: radha@ee.washington.edu
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